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What is the Difference between Undefined, undeclared, Null

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Yafet Segid answered on July 10, 2021 Popularity 10/10 Helpfulness 4/10

answer What is the Difference between Undefined, undeclared, Null

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What is the Difference between Undefined, undeclared, Null

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What is the Difference between Undefined, undeclared, Null

// undefined means that the variable has not been declared, or has not been given a value.
// Undefined is used for unintentionally missing values.
var dog;
console.log(dog);


// Undeclared means the variable does not exist in the program at all.
console.log(cat);


// Null used for intentionally missing values. It contains no value.

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Contributed on May 31 2022

Yafet Segid

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difference between undefined and null?

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null is a special object because typeof null returns 'object'. 
On the other hand,
undefined means that the variable has not been declared,
or has not been given a value.

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Contributed on Jul 10 2021

Good Gnu

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difference between undefined and null

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null == undefined

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Source: www.makeuseof.com

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Contributed on Oct 10 2022

Ken Kondo

0 Answers Avg Quality 2/10

What is the Difference between Undefined, undeclared, Null

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